Click the "table" button in the bbcode button list (third row of the buttons in the editor).

Click the "tr" (table row) button.

Optional: If you want a header, click the th button, then type in your header content, then move past the [/th] code, and repeat for each column heading you want. Then move past the [/tr] code, and click the "tr" button to start a new row.

Click the "td" (table data) button, type in your content, then move past the [/td] code, and repeat for each cell you want. (Then optionally press Enter to make it easier to read the codes when editing.)

Move past the [/tr] code, then repeat step 2 for each new row you want.

Make sure the close table code [/table] ends the table after the last [/tr].

Here's an example table:

WoW Races

What Forsaken think of them

Night Elves

delicious

Dwarves

stringy

Humans

bland

Gnomes

funny

Dranei

spicy

Worgen

gamey

The codes to produce that table shown here are (with carriage returns added for legibility):